Hi Don, my comment about Andy Rouse, whilst true, was put in tongue in cheek for a bit of fun. His criteria is obviously wildlife photography so presumably follow focus among others. Robs comments on focusing on the mug agree with my comments about working around problems by using the single central focusing point and finding an edge for greater contrast. Given two lenses of the same 'speed' and focal length one sometimes seems to focus better than the other which I have always put down to one lens having better contrast than the other. Any thoughts on that?
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